:root {
  color-scheme: dark;
  --bg: #07090b;
  --fg: #e9ecef;
  --muted: rgba(233, 236, 239, 0.48);
  --ghost: rgba(233, 236, 239, 0.12);
  --hairline: rgba(233, 236, 239, 0.12);
  --mx: 0;
  --my: 0;
}

* { box-sizing: border-box; }

html, body {
  width: 100%;
  min-height: 100%;
  margin: 0;
  background: var(--bg);
  color: var(--fg);
}

body {
  min-height: 100svh;
  overflow: hidden;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: 0.02em;
  isolation: isolate;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 8;
  background:
    radial-gradient(circle at 50% 44%, rgba(255,255,255,0.018), transparent 34%),
    linear-gradient(to bottom, rgba(255,255,255,0.015), transparent 16%, transparent 84%, rgba(255,255,255,0.012));
  mix-blend-mode: screen;
}

#world,
.veil,
.scan {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
}

#world {
  z-index: -4;
  opacity: 0;
  animation: world-in 3.8s 0.65s cubic-bezier(.2,.7,.2,1) forwards;
  transform: translate3d(calc(var(--mx) * -4px), calc(var(--my) * -3px), 0) scale(1.02);
}

.veil {
  z-index: -3;
  pointer-events: none;
  background:
    radial-gradient(ellipse at center, transparent 0 22%, rgba(7,9,11,0.18) 44%, rgba(7,9,11,0.86) 86%),
    linear-gradient(to bottom, rgba(7,9,11,0.58), transparent 30%, transparent 68%, rgba(7,9,11,0.78));
}

.scan {
  z-index: 6;
  pointer-events: none;
  opacity: 0.055;
  background: repeating-linear-gradient(
    to bottom,
    transparent 0,
    transparent 3px,
    rgba(255,255,255,0.04) 4px
  );
  mask-image: linear-gradient(to bottom, transparent, black 20%, black 80%, transparent);
}

.stage {
  width: 100%;
  min-height: 100svh;
  display: grid;
  place-items: center;
  position: relative;
  padding: max(28px, env(safe-area-inset-top)) max(24px, env(safe-area-inset-right)) max(88px, env(safe-area-inset-bottom)) max(24px, env(safe-area-inset-left));
}

.signal {
  display: flex;
  flex-direction: column;
  align-items: center;
  transform: translate3d(calc(var(--mx) * 4px), calc(var(--my) * 3px), 0);
}

.existence {
  appearance: none;
  border: 0;
  background: transparent;
  color: inherit;
  position: relative;
  width: min(42vw, 280px);
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  padding: 0;
  cursor: default;
  opacity: 0;
  animation: glyph-in 1.9s 0.1s cubic-bezier(.16,.84,.24,1) forwards;
  -webkit-tap-highlight-color: transparent;
}

.existence::before {
  content: "";
  position: absolute;
  inset: 16%;
  border: 1px solid rgba(233,236,239,0.08);
  transform: rotate(45deg) scale(0.72);
  opacity: 0;
  transition: opacity .8s ease, transform .8s ease;
}

.existence__glyph,
.existence__echo {
  position: absolute;
  font-family: "Cambria Math", "STIX Two Math", "Segoe UI Symbol", ui-serif, serif;
  font-size: clamp(8.5rem, 22vw, 16rem);
  line-height: .72;
  font-weight: 400;
  user-select: none;
}

.existence__glyph {
  filter: drop-shadow(0 0 30px rgba(255,255,255,0.035));
}

.existence__echo {
  color: transparent;
  -webkit-text-stroke: 1px rgba(233,236,239,0.08);
  transform: translate3d(calc(var(--mx) * 7px), calc(var(--my) * 7px), 0) scale(1.035);
  opacity: .55;
}

.existence:hover::before,
.existence:focus-visible::before,
.existence[data-open="true"]::before {
  opacity: 1;
  transform: rotate(45deg) scale(1);
}

.existence:focus-visible {
  outline: 1px solid rgba(233,236,239,0.2);
  outline-offset: 10px;
}

.brand {
  margin: clamp(-12px, -1.4vw, -4px) 0 0;
  font-size: clamp(1.1rem, 2.4vw, 1.9rem);
  font-weight: 560;
  letter-spacing: .25em;
  text-transform: uppercase;
  opacity: 0;
  transform: translateY(8px);
  animation: text-in 1.6s 1.65s ease forwards;
  white-space: nowrap;
}

.brand__exist {
  font-family: "Cambria Math", "STIX Two Math", "Segoe UI Symbol", ui-serif, serif;
  font-size: 1.06em;
  letter-spacing: .18em;
}

.question {
  margin: 18px 0 0;
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: clamp(.66rem, 1.2vw, .78rem);
  letter-spacing: .34em;
  opacity: 0;
  transform: translateY(6px);
  animation: text-in 1.8s 2.45s ease forwards;
}

.secret {
  min-height: 1em;
  margin: 13px 0 0;
  color: rgba(233,236,239,0.34);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: clamp(.54rem, 1vw, .66rem);
  letter-spacing: .19em;
  text-align: center;
  opacity: 0;
  transition: opacity .45s ease;
}

.secret[data-visible="true"] { opacity: 1; }

.status {
  position: absolute;
  left: 50%;
  bottom: max(72px, calc(env(safe-area-inset-bottom) + 62px));
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 9px;
  color: rgba(233,236,239,0.38);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .61rem;
  letter-spacing: .22em;
  white-space: nowrap;
  opacity: 0;
  animation: text-in 1.4s 3.35s ease forwards;
}

.status__pulse {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: currentColor;
  animation: pulse 2.4s ease-in-out infinite;
}

.footer {
  position: fixed;
  left: max(20px, env(safe-area-inset-left));
  right: max(20px, env(safe-area-inset-right));
  bottom: max(18px, env(safe-area-inset-bottom));
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  color: rgba(233,236,239,0.28);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .58rem;
  letter-spacing: .18em;
  opacity: 0;
  animation: text-in 1.4s 3.8s ease forwards;
}

.footer__nav {
  display: flex;
  gap: 18px;
}

.footer a {
  color: inherit;
  text-decoration: none;
  transition: color .25s ease;
}

.footer a:hover,
.footer a:focus-visible { color: rgba(233,236,239,0.72); }
.footer a:focus-visible { outline: 1px solid rgba(233,236,239,0.22); outline-offset: 5px; }

@keyframes glyph-in {
  0% { opacity: 0; transform: scale(.92); filter: blur(8px); }
  48% { opacity: .18; }
  100% { opacity: 1; transform: scale(1); filter: blur(0); }
}

@keyframes text-in {
  to { opacity: 1; transform: translateY(0); }
}

@keyframes world-in { to { opacity: .56; } }

@keyframes pulse {
  0%, 100% { opacity: .2; transform: scale(.8); }
  50% { opacity: .8; transform: scale(1.05); }
}

@media (max-width: 620px) {
  .existence { width: min(56vw, 250px); }
  .brand { letter-spacing: .16em; }
  .question { letter-spacing: .26em; }
  .footer { align-items: flex-end; }
  .footer__nav { flex-direction: column; gap: 8px; text-align: right; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }

  #world { opacity: .5; }
}